Plugging a stereo 1/4″ cable into the headphone output is the easiest way to get a decent recording of an Optigan®, though you have to be careful to set the volume pedal so as not to get alot of distortion. I usually shove books under the pedal to keep it in place as just the right spot. Also, be sure to plug the power cable in to the socket both ways in order to find the polarity that produces the least amount of hum/buzz.